基于CC1100的无线视频监控系统设计

为了对特定场合进行安全监控,采用CC1100无线传输模块和PTC08串口摄像头模块设计并实现了一种无线视频监控系统。利用摄像头模块对视频进行数据采集、压缩、串口传输,并利用微控制器通过无线传输模块进行拍摄控制、数据传输。经测试表明,该系统具有操作简便、运行稳定的特点,达到了设计要求。     

基于GSM短消息模式的生理参数远程传输

随着移动通讯技术的发展,GSM短消息技术已运用在许多监控系统中.本文基于西门子公司的TC35i模块,采用GSM短消息的方式,对测量到的人体生理参数进行远程的传输.根据TC35i模块的工作方式,设计出接口电路,利用串口对GSM模块进行控制,利用AT指令完成对GSM模块的软件编程,实现短消息无线传输的功能.     

基于STM32的以太网网络视频监控系统

基于STM32F407芯片、LAN8720A模块以及OV2640摄像头模块,设计了一种以太网网络视频监控系统。该视频监控系统使用UCOS-Ⅱ系统,以及Lw IP协议栈,利用OV2640摄像头模块采集数据。在UCOS-Ⅱ系统的调度下,使用Lw IP协议栈,利用TCP/IP协议,将采集到的数据上传到PC客户端,PC端能够实时地监控。相比Zig Bee传输技术而言,利用网络传输可大幅度提高数据传输的带宽,可以实现监控视频的实时传输以及高清画面的传输。     

基于TD-SCDMA的ARM9无线视频监控系统设计

本文设计了一个基于TQ2440开发板的无线视频监控系统,前端视频采集编码系统以嵌入式Linux操作系统为平台,运用MPEG-4编解码;传输系统采用中国移动的TD-SCDMA无线网络,无线传输模块采用重邮信科公司的基于TD-SCDMA的TD230A;后端监控系统采用客户机/服务器模式,监控软件采用Socket编程。本文阐述了整个系统的软硬件功能与组成,真正实现了视频监控的无线化,满足无线视频监控系统的要求。     

基于S3C2440的实时捕捉监控系统设计

设计了一款基于S3C2440芯片的最小化实时捕捉监控系统。该系统选择红外传感器、CMOS图像传感器OV9650、TQ043TSCM-V型LCD、SANDISK的SDHC,分别作为检测模块、图像采集模块、实时显示模块和储存模块。为使监控系统具有良好的实时性以及小巧的程序代码,采用裸机编程。经实际验证,系统对物体捕捉敏感,图像显示连续清晰,体现了良好的稳定性,具有较好的应用价值。     

基于S3C2440和RFID技术的智能监控系统

为了实现实时监控,设计了一种以ARM9芯片S3C2440为核心的智能监控系统.Nordic公司的nRF24L01芯片解决主控模块和电子标签的互相通信,实现远距离射频识别,工作于2.45 G.在房间内有东西被移出后,OV9650摄像头能够实时采集房间内的视频信息,并及时显示在群创3.7英寸TFT LCD屏上.实验结果表明,该设计运行稳定,是智能监控的一种有效解决方案.     

基于GSM/GPRS的机车无线传输平台设计

铁路系统中机车运行的安全性至关重要,随着科技的发展,机车运营部门正在逐步建立一套行之有效的运营安全监控体系.文中针对运营安全监控体系中的机务安全监控系统进行设计,运用GSM/GPRS技术构建了机车无线传输平台.文中介绍了机车无线传输平台的系统结构和功能,着重阐述了GSM/GPRS模块的软硬件设计思路,通过平台系统需求分析,给出了GSM/GPRS模块的硬件结构图和软件流程图.     

基于GPRS和嵌入式计算机的远程监控系统研究

本文设计和实现了基于GPRS传输的嵌入式远程监控系统,该监控系统由嵌入式计算机系统,USB摄像头模块和GPRS模块组成.研究了GPRS模块的工作原理以及网络链接,设计了针对该远程监控系统的嵌入式计算机系统,并成功实现了视频数据的采集、传输和接收.该监控系统灵活方便、体积小、功耗低.     

基于FPGA的激光笔辅助教学系统设计与实现

为了实现激光笔与大屏幕的互动,基于常用的OV9650摄像头模块和315MHz无线收发模块,采用了一种FPGA架构实现激光笔与大屏幕互动的设计方案。OV9650摄像头模块的采集信号由FPGA进行缓存和处理,由它计算出激光点的坐标,之后计算机接收激光点的坐标及激光笔发出的无线控制信号,通过授课主机端的软件实现激光笔与大屏幕的互动。目前该系统已应用于上海交通大学部分智能教室中,效果明显。     

基于WinCE的嵌入式视频数据采集系统设计

以嵌入式微处理器S3C2440为系统硬件平台核心,以WinCE操作系统为软件平台,构建了一种微型化的嵌入式视频数据采集系统.选择CMOS图像传感器0V9650为图像采集单元,设计了摄像头接口电路.采用1片输出电压为1.8 V及1片输出电压可调节的AS1117完成摄像头供电电路设计.系统Boatloader开发采用Nboot+Eboot的方案,Nboot完成初始化Flash等硬件,并将Eboot搬到SDRAM运行.而Eboot完成内存地址的映射以及其余设备的初始化、加载NK.bin内核文件.OV9650流接口驱动程序的设计部分,主要论述CIS_IOControl()、Cam_Init()等流接口函数的编写.在EVC开发环境中,基于MFC编程完成了系统应用软件开发,主要用Creatfile()函数打开驱动程序,调用DeviceloControl()函数来实现视频数据的采集与停止等功能.实验表明:OV9650驱动程序工作良好,采集到的视频数据清晰连续.     

Preparation and Characterization of TaN ALD Precursors

High purity organic-tantalum precursors for thin film ALD TaN were synthesized and characterized.Vapor pressure and thermal stability of these precursors were studied.From the vapor pressure analysis,it was found that TBTEMT has a higher vapor pressure than any other published liquid TaN precursor,including TBTDET,TAITMATA,and IPTDET.Thermal stability of the alkyl groups on the precursors was investigated using a 1H NMR technique.The results indicated that the tertbutylimino group is the most stable group on TBTDET and TBTEMT as compared to the dialkylamido groups.Thermal stability of TaN precursors decreased in the following order:TBTDET ＞ PDMAT ＞ TBTEMT.In conclusion,precursor vapor pressure and thermal stability were tuned by making slight variations in the ligand sphere around the metal center.     

Curved crystal spectrometer for the measurement of X-ray lines from laser-produced plasmas

In order to diagnose the laser-produced plasmas, a focusing curved crystal spectrometer has been developed for measuring the X-ray lines radiated from a laser-produced plasmas. The design is based on the fact that the ray emitted from a source located at one focus of an ellipse will converge on the other focus by the reflection of the elliptical surface. The focal length and the eccentricity of the ellipse are 1350 mm and 0.9586, respectively. The spectrometer can be used to measure the X- ray lines in the wavelength range of 0.2-0.37 nm, and a LiF crystal （200） （2d = 0.4027 nm） is used as dispersive element covering Bragg angle from 30° to 67.5°. The spectrometer was tested on Shengnang- Ⅱ which can deliver laser energy of 60-80 J/pulse and the laser wavelength is 0.35 μm. Photographs of spectra including the 1 s2p ^1P1-1s^2 ^1S0 resonance line（w）, the 1s2p ^3P2-1s^2 1S0 magnetic quadrupole line（x）, the 1s2p ^3P1-1 s^2 ^1S0 intercombination lines（y）, the 1 s2p ^3S~1-1 s^2 ^1S0 forbidden line（z） in helium-like Ti Ⅹ Ⅺ and the 1 s2s2p ^2P3/2-1 s622s ^2S1/2 line（q） in lithium-like Ti Ⅹ Ⅹhave been recorded with a X-ray CCD camera. The experimental result shows that the wavelength resolution（λ/△ 2） is above 1000 and the elliptical crystal spectrometer is suitable for X-ray spectroscopy.     

Electronic Structure of Semiconductor Nanocrystals

This paper reviews our recent development of the use of the large-scale pseudopotential method to calculate the electronic structure of semiconductor nanocrystals, such as quantum dots and wires, which often contain tens of thousands of atoms. The calculated size-dependent exciton energies and absorption spectra of quantum dots and wires are in good agreement with experiments. We show that the electronic structure of a nanocrystal can be tuned not only by its size,but also by its shape. Finally,we show that defect properties in quantum dots can be significantly different from those in bulk semiconductors.     

Critical Stage Rule-Based Real Time Dispatch（RTD）System in Highly-Mixed-Products （HMP） FAB

An improving utilization and efficiency of critical equipments in semiconductor wafer fabrication facilities are concerned. Semiconductor manufacturing FAB is one of the most complicated and cost sensitive environments. A good dispatching tool will make big difference in equipment utilization and FAB output as a whole. The equipment in this paper is In-Line DUV Scanner. There are many factors impacting utilization and output on this equipment group. In HMP environment one of the issues is changing of reticule in this area and idle counts due to load unbalance between equipments. Here we'll introduce a rule-based RTD system which aiming at decreasing the number of recipe change and idle counts among a group of scanner equipment in a high-mixed-products FAB.     

GaAsSb/InAlAs PA DHBTs Grown by Production MBE

The epi material growth of GaAsSb based DHBTs with InAlAs emitters are investigated using a 4 × 100mm multi-wafer production Riber 49 MBE reactor fully equipped with real-time in-situ sensors including an absorption band edge spectroscope and an optical-based flux monitor. The state-of-the-art hole mobilities are obtained from 100nm thick carbon-doped GaAsSb. A Sb composition variation of less than ± 0.1 atomic percent across a 4 × 100mm platen configuration has been achieved. The large area InAlAs/GaAsSb/InP DHBT device demonstrates excellent DC characteristics,such as BVCEO＞6V and a DC current gain of 45 at 1kA/cm2 for an emitter size of 50μm × 50μm. The devices have a 40nm thick GaAsSb base with p-doping of 4. 5 × 1019cm-3 . Devices with an emitter size of 4μm × 30μm have a current gain variation less than 2% across the fully processed 100mm wafer. ft and fmax are over 50GHz,with a power efficiency of 50% ,which are comparable to standard power GaAs HBT results. These results demonstrate the potential application of GaAsSb/InP DHBT for power amplifiers and the feasibility of multi-wafer MBE for mass production of GaAsSb-based HBTs.     

Noise character analysis and the restraint of self-pulsation laser diodes

We calculate the Langevin noise sources of self-pulsation laser diodes, analyze the effects of active region noise and saturable-absorption region noise on the power fluctuation as well as period fluctuation, and propose a novel method to restrain the noise effects. A visible SIMULINK model is established to simulate the system, The results indicate that the effects of noise in absorption region can be ignored; that with the increase of DC injecting current, the noise effects enhance power jitter, and nevertheless, the period jitter is decreased; and that with external sinusoidal current modulating the self-pulsation laser diode, the noise-induced power jitter and period jitter can be suppressed greatly. This work is valuable for clock recovery in all-optical network.     

High-quality single-crystal CdSe nanoribbons and their optical properties

Large-scale synthesis of single-crystal CdSe nanoribbons is achieved by a modified thermal evaporation method, in which two-step-thermal-evaporation is used to control CdSe sources＇ evaporation. The synthesized CdSe nanoribbons are usually several micrometers in width, 50 nm in thickness, and tens to several hundred micrometers in length. Studies have shown that high-quality CdSe nanoribbons with regular shapes can be obtained by this method. Room-temperature photolumines-cence indicates that the lasing emission at 710 nm has been observed under optical pumping （266 nm） at power densities of 25-153 kW/cm^2. The full width half maximum （FWHM） of the lasing mode is 0.67 nm     

Propagation of hermite-cosh-gaussian beams passing through ABCD optical system with an annular aperture

By using the expansion of the aperture function into a finte sum of complex Gaussian functions, the corresponding analytical expressions of Hermite-cosh-Gaussian beams passing through annular apertured paraxially and symmetrically optical systems written in terms of ABCD matrix were derived, and they could reduce to the cases with squared aperture. In a similar way, the corresponding analytical expressions of cosh-Gaussian beams through annular apertured ABCD matrix were also given. The method could save more calculation time than that by using the diffraction integral formula directly.     

Influence of polarization extinction ratio on distributed polarization coupling detection

Distributed polarization coupling in polarization-maintaining fibers can be detected by using a white light Michelson interferometer. This technique usually requires that only one polarization mode is excited. However, in practical measurement, the injection polarization direction could not be exactly aligned to one of the principal axes of the PMF, so the influence of the polarization extinction ratio should be considered. Based on the polarization coupling theory, the influence of the incident polarization extinction on the measurement result is evaluated and analyzed, and a method for distributed polarization coupling detection is developed when both two orthogonal eigenmodes are excited.     

Call for Papers

正Communications—VLSI Researches and industries of telecommunications have been growing rapidly in the last 20 years and will keep their high growing pace in the next decade.The involved researches and developments cover mobile communications,highway and last-mile broadband communication,domain specific communications,and emerging D2D M2M communications.Radio communication steps into its